The California Air Resources Board announced it settled 256 cases last year involving air quality violations by heavy-duty diesel truck and bus fleets that failed to comply with its various air quality programs with fines totaling nearly $2.2 million.

Arkansas-based Sherman Brothers Trucking, doing business as Team Transport, has been cited by the U.S. Department of Labor's Occupational Safety and Health Administration for 11 safety and health violations and has proposed a penalty of $113,400.

The California Air Resources Board has fined Bakersfield-based KS Industries, an engineering and construction firm, $230,250 for failing to update its diesel trucks to clean up harmful emissions as required by state anti-pollution laws.